Variable color format based video encoding and decoding methods and apparatuses

a video encoding and video decoding technology, applied in the direction of color television with bandwidth reduction, signal generator with optical-mechanical scanning, television systems, etc., can solve the problems of video quality degradation of video based on ycbcr color format, color deterioration, and video quality degradation of video based on rgb format,

Inactive Publication Date: 2009-06-11
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

But, in the format converting process, color deterioration may occur, and the video based on the YCbCr color format has relatively degraded video quality as compared with the video based on the RGB color format.
However, as the bit-rate decreases, the quality of the video based on the RGB format may be more degraded than the video based on the YCbCr format.
As described above, the video coding method based on the RGB format has the problem of video quality deterioration when a given bit-rate decreases due to bandwidth limitation of wired or wireless channels.

Method used

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  • Variable color format based video encoding and decoding methods and apparatuses
  • Variable color format based video encoding and decoding methods and apparatuses
  • Variable color format based video encoding and decoding methods and apparatuses

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Embodiment Construction

[0023]Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the attached drawings.

[0024]FIG. 2 is a block diagram illustrating a video encoding apparatus 200 according to an embodiment of the present invention.

[0025]Referring to FIG. 2, the video encoding apparatus 200 according to the embodiment includes a color format determiner 210, a switch 220, a color format converter 230, a sampler 240, and an encoder 250.

[0026]The color format determiner 210 determines whether or not to convert (referred to as transform) an input video in a current encoding unit of a first color format into a second color format, by using at least one or more of channel state information and a result of encoding a video in a previous encoding unit encoded by the encoder 250. For convenience of description, the first color format is an RGB (red, blue, green) color format, and the second color format is a YCbCr color format. However, it will be understood by ...

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Abstract

Provided are video encoding and decoding methods and apparatuses for encoding a video by variably selecting one from two or more difference color formats. Accordingly, by using at least one of channel state information and a result of encoding a video in a predetermined encoding unit encoded in advance, whether or not to convert a video in a current encoding unit of an input RGB (red, green, blue) color format into a YCbCr color format is adaptively determined to perform encoding. Therefore, a video with uniform quality corresponding to a channel environment having a variable bit-rate can be provided.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION[0001]This application claims the benefit of Korean Patent Application No. 10-2007-0125770, filed on Dec. 5, 2007, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a video encoding method and apparatus and a video decoding method and apparatus, and more particularly, to a video encoding method and apparatus and a video decoding method and apparatus capable of variably selecting an RGB (red, green, blue) format or a YCbCr format by using channel information or encoding information to perform encoding.[0004]2. Description of the Related Art[0005]In general, an initial image is taken in an RGB (red, blue, green) color format. In order to compress a video, a YCbCr color format using relatively less data than that of the RGB color format has been used. By converting an image inp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N7/12
CPCH04N19/172H04N19/15H04N19/164H04N19/61H04N19/186H04N19/102H04N11/04
Inventor SONG, BYUNG-CHEOLLEE, YUN-GUKIM, NAK-HOON
Owner SAMSUNG ELECTRONICS CO LTD
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